added code of conduct

CODE_OF_CONDUCT.md

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+# Asciibird Code of Conduct
+
+## Be respectful
+
+In a project the size of asciibird, inevitably there will be people with
+whom you may disagree, or find it difficult to cooperate. Accept that,
+but even so, remain respectful. Disagreement is no excuse for poor
+behaviour or personal attacks, and a community in which people feel
+threatened is not a healthy community.
+
+## Assume good faith
+
+asciibird Contributors have many ways of reaching our common goal of a
+[free](https://www.debian.org/intro/free) ascii editor which may differ
+from your ways. Assume that other people are working towards this goal.
+
+Note that many of our Contributors are not native English speakers or
+may have different cultural backgrounds.
+
+## Be collaborative
+
+asciibird is a large and complex project; there is always more to learn
+within asciibird. It's good to ask for help when you need it. Similarly,
+offers for help should be seen in the context of our shared goal of
+improving asciibird.
+
+When you make something for the benefit of the project, be willing to
+explain to others how it works, so that they can build on your work to
+make it even better.
+
+## Try to be concise
+
+Keep in mind that what you write once will be read by hundreds of
+persons. Writing a short email means people can understand the
+conversation as efficiently as possible. When a long explanation is
+necessary, consider adding a summary.
+
+Try to bring new arguments to a conversation so that each mail adds
+something unique to the thread, keeping in mind that the rest of the
+thread still contains the other messages with arguments that have
+already been made.
+
+Try to stay on topic, especially in discussions that are already fairly
+large.
+
+## Be open
+
+Most ways of communication used within asciibird allow for public and
+private communication. As per paragraph three of the [Debian social
+contract](https://www.debian.org/social_contract), you should preferably
+use public methods of communication for asciibird-related messages, unless
+posting something sensitive.
+
+This applies to messages for help or asciibird-related support, too; not
+only is a public support request much more likely to result in an answer
+to your question, it also makes sure that any inadvertent mistakes made
+by people answering your question will be more easily detected and
+corrected.
+
+## In case of problems
+
+While this code of conduct should be adhered to by participants, we
+recognize that sometimes people may have a bad day, or be unaware of
+some of the guidelines in this code of conduct. When that happens, you may
+reply to them and point out this code of conduct. Such messages may be
+in public or in private, whatever is most appropriate. However,
+regardless of whether the message is public or not, it should still
+adhere to the relevant parts of this code of conduct; in particular, it
+should not be abusive or disrespectful. Assume good faith; it is more
+likely that participants are unaware of their bad behaviour than that
+they intentionally try to degrade the quality of the discussion.
+
+Serious or persistent offenders will be temporarily or permanently
+banned from communicating through asciibird's systems. Complaints should be
+made (in private) to the administrators of the asciibird communication
+forum in question.
+
+# Further reading
+
+Some of the links in this section do not refer to documents that are
+part of this code of conduct, nor are they authoritative within asciibird.
+However, they all do contain useful information on how to conduct
+oneself on our communication channels.
+
+- Debian has a [diversity statement](https://www.debian.org/intro/diversity)
+- The [Debian Community Guidelines](https://people.debian.org/~enrico/dcg/)
+  by Enrico Zini contain some advice on how to communicate effectively.
+- The [Debian Mailing list code of
+  conduct](https://www.debian.org/MailingLists/#codeofconduct) is useful for
+  advice specific to Debian mailing lists.